Barium ferrite has a greatly reduced coercivitywhen it is produced (by self-propagating high-temperature synthesis) in the presence of an external magnetic field rather than zero field. This and other significant magnetic field effects, for example, an increase in the speed of the propagation wave, an increased reaction temperature, and a change in the microstructure (see Figure) are reported.
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Affleck et al. (2000) studied this question.